Re: [RFC PATCH v2 1/8] virtio: introduce virtio_features_t

[kernel test robot <lkp@intel.com>]

Hi Paolo,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build errors:

[auto build test ERROR on mst-vhost/linux-next]
[also build test ERROR on net/main net-next/main linus/master v6.15 next-20250530]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Paolo-Abeni/virtio-introduce-virtio_features_t/20250530-225213
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next
patch link:    https://lore.kernel.org/r/5be304a8d0e2fffa6bd13cfa9ff848b2e5842171.1748614223.git.pabeni%40redhat.com
patch subject: [RFC PATCH v2 1/8] virtio: introduce virtio_features_t
config: riscv-randconfig-002-20250530 (https://download.01.org/0day-ci/archive/20250531/202505310153.xoBJS3F5-lkp@intel.com/config)
compiler: riscv32-linux-gcc (GCC) 10.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250531/202505310153.xoBJS3F5-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202505310153.xoBJS3F5-lkp@intel.com/

All error/warnings (new ones prefixed by >>):

   In file included from include/linux/bits.h:6,
                    from include/linux/bitops.h:6,
                    from include/linux/kernel.h:23,
                    from include/linux/uio.h:8,
                    from include/linux/socket.h:8,
                    from include/uapi/linux/in.h:25,
                    from include/linux/in.h:19,
                    from net/9p/trans_virtio.c:16:
   include/linux/virtio_features.h: In function 'VIRTIO_BIT':
>> include/linux/virtio_features.h:21:33: error: 'b' undeclared (first use in this function); did you mean 'mb'?
      21 |  return bit >= 64 ? 0 : BIT_ULL(b);
         |                                 ^
   include/vdso/bits.h:8:34: note: in definition of macro 'BIT_ULL'
       8 | #define BIT_ULL(nr)  (ULL(1) << (nr))
         |                                  ^~
   include/linux/virtio_features.h:21:33: note: each undeclared identifier is reported only once for each function it appears in
      21 |  return bit >= 64 ? 0 : BIT_ULL(b);
         |                                 ^
   include/vdso/bits.h:8:34: note: in definition of macro 'BIT_ULL'
       8 | #define BIT_ULL(nr)  (ULL(1) << (nr))
         |                                  ^~
   In file included from include/linux/virtio.h:14,
                    from net/9p/trans_virtio.c:34:
>> include/linux/virtio_features.h:22:1: warning: control reaches end of non-void function [-Wreturn-type]
      22 | }
         | ^


vim +21 include/linux/virtio_features.h

    18	
    19	static inline u64 VIRTIO_BIT(int bit)
    20	{
  > 21		return bit >= 64 ? 0 : BIT_ULL(b);
  > 22	}
    23	

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